Deodorized colorant of brassicaceae plant

Abstract

A colorant of a plant belonging to the family Brassicaceae which has no or significantly reduced smell originating in the Brassicaceae plant, a colorant formulation containing this colorant, and a process for producing the odorless or almost odorless colorant of the Brassicaceae plant. This colorant can be prepared by treating an adsorption-treated Brassicaceae plant colorant extract by at least one method selected from among adsorption, ion exchange, acid treatment, and membrane separation to thereby give an aroma component concentration of 100 ppm or less in case where the color value E 10% 1 cm is 80.

1. A method for preparing a deodorized Brassicaceae plant colorant, comprising:
 subjecting an adsorption-treated Brassicaceae plant colorant extract to a combination of an acid treatment at a temperature in the range of 80° C. to 100° C. to produce an acid treated extract; 
 optionally subjecting said acid treated extract to one or more of adsorption and ion exchange, and 
 subjecting said extract to membrane separation. 
 
     
     
       2. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 1 , wherein the Brassicaceae plant colorant extract is obtained either by extracting while a Brassicaceae plant is finely sliced in an acidic extraction solvent, or by putting a finely sliced Brassicaceae plant in an acidic extraction solvent and extracting by soaking. 
     
     
       3. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 2 , wherein the pH of the acidic extraction solvent is from 1 to 4. 
     
     
       4. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 2 , wherein the Brassicaceae plant colorant extract is obtained by soaking a Brassicaceae plant in an acidic extraction solvent, and then performing a heating treatment. 
     
     
       5. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 1 , wherein the acid treatment involves the use of an acid used as a food additive. 
     
     
       6. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 1 , wherein the acid treatment involves the use of at least one inorganic acid selected from the group consisting of sulfuric acid, hydrochloric acid, phosphoric acid, and nitric acid. 
     
     
       7. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 1 , wherein the acid treatment essentially consists of exposing a Brassicaceae plant colorant extract that has undergone an adsorption treatment or any of various other treatments to a pH of 1 to 4. 
     
     
       8. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 1 , wherein the membrane separation is at least one treatment selected from the group consisting of membrane filtering, ultrafiltration, reverse osmosis, electrolysis, ion selective membrane treatment, and ion exchange. 
     
     
       9. A method for preparing a deodorized Brassicaceae plant colorant, comprising:
 optionally further adsorbing an adsorption-treated Brassicaceae plant colorant extract to produce an optionally adsorbed colorant; 
 deproteinizing said optionally adsorbed colorant to produce a deproteinized colorant; 
 acid treating said deproteinized colorant at a temperature in the range of 80° C. to 100° C. to produce an acid treated colorant; and 
 subjecting said acid treated colorant to membrane separation. 
 
     
     
       10. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 9 , wherein the membrane separation is at least one treatment selected from reverse osmosis and ultrafiltration. 
     
     
       11. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 9 , wherein the membrane separation makes use of a membrane whose molecular weight cut off is from 2000 to 4000. 
     
     
       12. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 9 , wherein the deproteinization treatment is at least one treatment selected from the group consisting of ion exchange, extraction, membrane separation, and gel filtration. 
     
     
       13. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 12 , wherein the membrane separation performed as the deproteinization treatment makes use of a membrane whose molecular weight cut off is from 10 4  to 10 6 . 
     
     
       14. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 1 , wherein the Brassicaceae plant colorant is an anthocyanin colorant originating in a Brassicaceae plant. 
     
     
       15. The method for preparing a deodorized Brassicaceae plant colorant according to  claim 9 , wherein the Brassicaceae plant colorant is an anthocyanin colorant originating in a Brassicaceae plant.